Ultimately, the City cancelled the event due to “concerns about safety and security arising from volatile public commentary,” according to a release from the City of Calgary.

The Calgary Police Service said in a statement that a threat had been made regarding the naked swim event.

“The Calgary Police Service can confirm that on Monday, January 8, 2018, police received a report of a threat to the Southland Leisure Centre in relation to the naturalist swim event. District officers responded at the time of the incident and determined there was no immediate danger,” the statement read.

The City also stated that the cancellation was not due to the nature of the event, and that these swims have been held at the facilities in the past without any incident. They said that a decision has not been made about future bookings for the naturalist group, though Calgary Recreation has been in contact with the organizers.

“The City reserves the right to cancel or amend permits should special circumstances arise. Unfortunately, recent events have created the potential to impact the safety of participants, public and staff, and required the cancellation of this booking,” said James McLaughlin, acting director of Calgary Recreation, in the release.